diff options
| author | Kuniyuki Iwashima <[email protected]> | 2022-07-20 16:50:16 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2022-07-22 11:06:17 +0000 |
| commit | 8499a2454d9e8a55ce616ede9f9580f36fd5b0f3 (patch) | |
| tree | 180282d27d317a32fa51643db6677b71e3d59f14 /net/ipv4/tcp_metrics.c | |
| parent | tcp: Fix a data-race around sysctl_tcp_frto. (diff) | |
| download | kernel-8499a2454d9e8a55ce616ede9f9580f36fd5b0f3.tar.gz kernel-8499a2454d9e8a55ce616ede9f9580f36fd5b0f3.zip | |
tcp: Fix a data-race around sysctl_tcp_nometrics_save.
While reading sysctl_tcp_nometrics_save, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/ipv4/tcp_metrics.c')
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index a501150deaa3..9dcc418a26f2 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -329,7 +329,7 @@ void tcp_update_metrics(struct sock *sk) int m; sk_dst_confirm(sk); - if (net->ipv4.sysctl_tcp_nometrics_save || !dst) + if (READ_ONCE(net->ipv4.sysctl_tcp_nometrics_save) || !dst) return; rcu_read_lock(); |